Camera optical lens

ABSTRACT

The present disclosure relates to the field of optical lenses and provides a camera optical lens. The camera optical lens includes, from an object side to an image side: a first lens; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; a seventh lens; and an eighth lens. The camera optical lens satisfies following conditions: 3.50≤f1/f≤6.50; f2≤0; and 1.55≤n8≤1.70, where f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; f2 denotes a focal length of the second lens; and n8 denotes a refractive index of the eighth lens. The present disclosure can achieve ultra-thin, wide-angle lenses having a big aperture.

TECHNICAL FIELD

The present disclosure relates to the field of optical lens, and more particularly, to a camera optical lens suitable for handheld terminal devices such as smart phones or digital cameras and camera devices such as monitors or PC lenses.

BACKGROUND

With the emergence of smart phones in recent years, the demand for miniature camera lens is increasing day by day, but in general the photosensitive devices of camera lens are nothing more than Charge Coupled Device (CCD) or Complementary Metal-Oxide Semiconductor Sensor (CMOS sensor), and as the progress of the semiconductor manufacturing technology makes the pixel size of the photosensitive devices become smaller, plus the current development trend of electronic products towards better functions and thinner and smaller dimensions, miniature camera lenses with good imaging quality therefore have become a mainstream in the market.

In order to obtain better imaging quality, the lens that is traditionally equipped in mobile phone cameras adopts a three-piece or four-piece lens structure, or even a five-piece or six-piece structure. Also, with the development of technology and the increase of the diverse demands of users, and as the pixel area of photosensitive devices is becoming smaller and smaller and the requirement of the system on the imaging quality is improving constantly, an eight-piece lens structure gradually appears in lens designs. Although the common eight-piece lens has good optical performance, its settings on refractive power, lens spacing and lens shape still have some irrationality, which results in that the lens structure cannot achieve a high optical performance while satisfying design requirements for ultra-thin, wide-angle lenses having a big aperture.

SUMMARY

In view of the problems, the present disclosure aims to provide a camera lens, which can achieve a high imaging performance while satisfying design requirements for ultra-thin, wide-angle lenses having a big aperture.

In an embodiment, the present disclosure provides a camera optical lens. The camera optical lens includes, from an object side to an image side: a first lens; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; a seventh lens; and an eighth lens. The camera optical lens satisfies following conditions: 3.50≤f1/f≤6.50; f2≤0; and 1.55≤n8≤1.70, where f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; f2 denotes a focal length of the second lens; and n8 denotes a refractive index of the eighth lens.

The present disclosure can achieve ultra-thin, wide-angle lenses having high optical performance and a big aperture, which are especially suitable for camera lens assembly of mobile phones and WEB camera lenses formed by CCD, CMOS and other imaging elements for high pixels.

BRIEF DESCRIPTION OF DRAWINGS

Many aspects of the exemplary embodiment can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.

FIG. 1 is a schematic diagram of a structure of a camera optical lens in accordance with Embodiment 1 of the present disclosure;

FIG. 2 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 1;

FIG. 3 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 1;

FIG. 4 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 1;

FIG. 5 is a schematic diagram of a structure of a camera optical lens in accordance with Embodiment 2 of the present disclosure;

FIG. 6 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 5;

FIG. 7 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 5;

FIG. 8 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 5;

FIG. 9 is a schematic diagram of a structure of a camera optical lens in accordance with Embodiment 3 of the present disclosure;

FIG. 10 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 9;

FIG. 11 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 9; and

FIG. 12 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 9.

DESCRIPTION OF EMBODIMENTS

The present disclosure will hereinafter be described in detail with reference to several exemplary embodiments. To make the technical problems to be solved, technical solutions and beneficial effects of the present disclosure more apparent, the present disclosure is described in further detail together with the figure and the embodiments. It should be understood the specific embodiments described hereby is only to explain the disclosure, not intended to limit the disclosure.

Embodiment 1

Referring to FIG. 1, the present disclosure provides a camera optical lens 10. FIG. 1 shows the camera optical lens 10 according to Embodiment 1 of the present disclosure. The camera optical lens 10 includes 8 lenses. Specifically, the camera optical lens 10 includes, from an object side to an image side, an aperture S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8. An optical element such as a glass filter (GF) can be arranged between the eighth lens L8 and an image plane Si.

The first lens L1 has a positive refractive power, the second lens L2 has a negative refractive power, the third lens L3 has a positive refractive power, the fourth lens L4 has a negative refractive power, the fifth lens L5 has a negative refractive power, the sixth lens L6 has a negative refractive power, the seventh lens L7 has a positive refractive power, and the eighth lens L8 has a negative refractive power.

Here, a focal length of the camera optical lens 10 is defined as f, and a focal length of the first lens L1 is defined as f1. The camera optical lens 10 should satisfy a condition of 3.50≤f1/f≤6.50. When the condition is satisfied, a spherical aberration and the field curvature of the system can be effectively balanced. As an example, 3.5≤f1/f≤6.46.

A focal length of the second lens L2 is defined as f2, which satisfies a condition of f2≤0. This condition specifies a sign of the focal length of the second lens. This leads to the more appropriate distribution of the refractive power, thereby achieving a better imaging quality and a lower sensitivity.

A refractive index of the eighth lens L8 is defined as n8, which satisfies a condition of 1.55≤n8≤1.70. This condition specifies the refractive index of the eighth lens. This facilitates development towards ultra-thin lenses while facilitating correction of aberrations. As an example, 1.56≤n8≤1.69.

A curvature radius of an object side surface of the first lens L1 is defined as R1, and a curvature radius of an image side surface of the first lens L1 is defined as R2. The camera optical lens 10 should satisfy a condition of −22.00≤(R1+R2)/(R1−R2)≤−10.00, which specifies a shape of the first lens. This condition can alleviate the deflection of light passing through the lens while effectively reducing aberrations. As an example, −21.75≤(R1+R2)/(R1−R2)≤−10.38.

The focal length of the sixth lens L6 is defined as f6. The camera optical lens 10 should satisfy a condition of −3.00≤f6/f≤−1.50. This condition can lead to the more appropriate distribution of the refractive power, thereby achieving a better imaging quality and a lower sensitivity. As an example, −2.85≤f6/f≤−1.63.

An on-axis thickness of the first lens L1 is defined as d1, and a total optical length from the object side surface of the first lens to an image plane of the camera optical lens along an optic axis is defined as TTL. The camera optical lens 10 should satisfy a condition of 0.02≤d1/TTL≤0.07. This condition can facilitate achieving ultra-thin lenses. As an example, 0.03≤d1/TTL≤0.05.

The focal length of the camera optical lens 10 is defined as f, and the focal length of the second lens L2 is defined as f2. The camera optical lens 10 should satisfy a condition of −40.95≤f2/f≤−12.25. This condition can facilitate correction aberrations of the optical system by controlling a negative refractive power of the second lens L2 within a reasonable range. As an example, −25.59≤f2/f≤−15.32.

A curvature radius of an object side surface of the second lens L2 is defined as R3, and a curvature radius of an image side surface of the second lens L2 is defined as R4. The camera optical lens 10 should satisfy a condition of 10.10≤(R3+R4)/(R3−R4)≤33.07, which specifies a shape of the second lens L2. This can facilitate correction of an off-axis aberration with development towards ultra-thin lenses. As an example, 16.16≤(R3+R4)/(R3−R4)≤26.46.

An on-axis thickness of the second lens L2 is defined as d3. The camera optical lens 10 should satisfy a condition of 0.02≤d3/TTL≤0.07. This condition can facilitate achieving ultra-thin lenses. As an example, 0.03≤d3/TTL≤0.06.

The focal length of the camera optical lens 10 is defined as f, and the focal length of the third lens L3 is defined as f3. The camera optical lens 10 should satisfy a condition of 0.48≤f3/f≤1.47. This condition can lead to the more appropriate distribution of the refractive power, thereby achieving a better imaging quality and a lower sensitivity. As an example, 0.77≤f3/f≤1.17.

A curvature radius of an object side surface of the third lens L3 is defined as R5, and a curvature radius of an image side surface of the third lens L3 is defined as R6. The camera optical lens 10 should satisfy a condition of −0.35≤(R5+R6)/(R5−R6)≤−0.10, which specifies a shape of the third lens. This condition can alleviate the deflection of light passing through the lens while effectively reducing aberrations. As an example, −0.22≤(R5+R6)/(R5−R6)≤−0.13.

An on-axis thickness of the third lens L3 is defined as d5. The camera optical lens 10 should satisfy a condition of 0.05≤d5/TTL≤0.15. This condition can facilitate achieving ultra-thin lenses. As an example, 0.08≤d5/TTL≤0.12.

The focal length of the camera optical lens 10 is defined as f, and the focal length of the fourth lens L4 is defined as f4. The camera optical lens 10 should satisfy a condition of −6.42≤f4/f≤−1.96, which specifies a ratio of the focal length of the fourth lens and the focal length of the camera optical lens. This condition can facilitate improving the optical performance of the system. As an example, −4.01≤f4/f≤−2.45.

A curvature radius of an object side surface of the fourth lens L4 is defined as R7, and a curvature radius of an image side surface of the fourth lens L4 is defined as R8. The camera optical lens 10 should satisfy a condition of 1.43≤(R7+R8)/(R7−R8)≤4.56, which specifies a shape of the fourth lens L4. This can facilitate correction of an off-axis aberration with development towards ultra-thin lenses. As an example, 2.28≤(R7+R8)/(R7−R8)≤3.65.

An on-axis thickness of the fourth lens L4 is defined as d7. The camera optical lens 10 should satisfy a condition of 0.02≤d7/TTL≤0.06. This condition can facilitate achieving ultra-thin lenses. As an example, 0.03≤d7/TTL≤0.05.

The focal length of the camera optical lens 10 is defined as f, and the focal length of the fifth lens L5 is defined as f5. The camera optical lens 10 should satisfy a condition of −32.96≤f5/f≤−9.79. This condition can effectively make a light angle of the camera optical lens gentle and reduce the tolerance sensitivity. As an example, −20.60≤f5/f≤−12.24.

A curvature radius of an object side surface of the fifth lens L5 is defined as R9, and a curvature radius of an image side surface of the fifth lens L5 is defined as R10. The camera optical lens 10 should satisfy a condition of 2.39≤(R9+R10)/(R9−R10)≤7.72, which specifies a shape of the fifth lens L5. This can facilitate correction of an off-axis aberration with development towards ultra-thin lenses. As an example, 3.82≤(R9+R10)/(R9−R10)≤6.18.

An on-axis thickness of the fifth lens L5 is defined as d9. The camera optical lens 10 should satisfy a condition of 0.01≤d9/TTL≤0.05. This condition can facilitate achieving ultra-thin lenses. As an example, 0.02≤d9/TTL≤0.04.

A curvature radius of an object side surface of the sixth lens L6 is defined as R11, and a curvature radius of an image side surface of the sixth lens L6 is defined as R12. The camera optical lens 10 should satisfy a condition of 1.69≤(R11+R12)/(R11−R12)≤7.45, which specifies a shape of the sixth lens L6. This can facilitate correction of an off-axis aberration with development towards ultra-thin lenses. As an example, 2.70≤(R11+R12)/(R11−R12)≤5.96.

An on-axis thickness of the sixth lens L6 is defined as d1. The camera optical lens 10 should satisfy a condition of 0.02≤d11/TTL≤0.09. This condition can facilitate achieving ultra-thin lenses. As an example, 0.04≤d11/TTL≤0.07.

The focal length of the camera optical lens 10 is defined as f, and the focal length of the seventh lens L7 is defined as f7. The camera optical lens 10 should satisfy a condition of 0.44≤f7/f≤1.43. This condition can lead to the more appropriate distribution of the refractive power, thereby achieving a better imaging quality and a lower sensitivity. As an example, 0.70≤f7/f≤1.14.

A curvature radius of an object side surface of the seventh lens L7 is defined as R13, and a curvature radius of an image side surface of the seventh lens L7 is defined as R14. The camera optical lens 10 should satisfy a condition of −3.17≤(R13+R14)/(R13−R14)≤−0.87, which specifies a shape of the seventh lens L7. This can facilitate correction of an off-axis aberration with development towards ultra-thin lenses. As an example, −1.98≤(R13+R14)/(R13−R14)≤−1.09.

An on-axis thickness of the seventh lens L7 is defined as d13. The camera optical lens 10 should satisfy a condition of 0.06≤d13/TTL≤0.20. This condition can facilitate achieving ultra-thin lenses. As an example, 0.10≤d13/TTL≤0.16.

The focal length of the camera optical lens 10 is defined as f, and the focal length of the eighth lens L8 is defined as f8. The camera optical lens 10 should satisfy a condition of −1.56≤f8/f≤−0.48. This condition can lead to the more appropriate distribution of the refractive power, thereby achieving a better imaging quality and a lower sensitivity. As an example, −0.97≤f8/f≤−0.60.

A curvature radius of an object side surface of the eighth lens L8 is defined as R15, and a curvature radius of an image side surface of the eighth lens L8 is defined as R16. The camera optical lens 10 should satisfy a condition of −0.81≤(R15+R16)/(R15−R16)≤−0.24, which specifies a shape of the eighth lens L8. This can facilitate correction of an off-axis aberration with development towards ultra-thin lenses. As an example, −0.51≤(R15+R16)/(R15−R16)≤−0.30.

An on-axis thickness of the eighth lens L8 is defined as d15. The camera optical lens 10 should satisfy a condition of 0.04≤d15/TTL≤0.17. This condition can facilitate achieving ultra-thin lenses. As an example, 0.07≤d15/TTL≤0.13.

In this embodiment, an image height of the camera optical lens 10 is defined as IH. The camera optical lens 10 should satisfy a condition of TTL/IH≤1.44. This condition can facilitate achieving ultra-thin lenses.

In this embodiment, an F number of the camera optical lens 10 is smaller than or equal to 2.01, thereby leading to a big aperture and high imaging performance.

When the focal length of the camera optical lens 10, the focal lengths of respective lenses, the refractive index of the seventh lens, the on-axis thicknesses of respective lenses, the TTL, and the curvature radius of object side surfaces and image side surfaces of respective lenses satisfy the above conditions, the camera optical lens 10 will have high optical performance while achieving ultra-thin, wide-angle lenses having a big aperture. The camera optical lens 10 is especially suitable for camera lens assembly of mobile phones and WEB camera lenses formed by CCD, CMOS and other imaging elements for high pixels.

In the following, examples will be used to describe the camera optical lens 10 of the present disclosure. The symbols recorded in each example will be described as follows. The focal length, on-axis distance, curvature radius, on-axis thickness, inflexion point position, and arrest point position are all in units of mm.

TTL: Optical length (the total optical length from the object side surface of the first lens L1 to the image plane of the camera optical lens along the optic axis) in mm.

In an example, inflexion points and/or arrest points can be arranged on the object side surface and/or image side surface of the lens, so as to satisfy the demand for the high quality imaging. The description below can be referred to for specific implementations.

Table 1 and Table 2 show design data of the camera optical lens 10 according to Embodiment 1 of the present disclosure.

TABLE 1 R d nd vd S1 ∞ d0 =  −0.571  R1 3.145 d1 =  0.443 nd1 1.5444 v1 55.82 R2 3.789 d2 =  0.410 R3 6.889 d3 =  0.480 nd2 1.6449 v2 22.54 R4 6.239 d4 =  0.076 R5 6.857 d5 =  1.009 nd3 1.5444 v3 55.82 R6 −9.726 d6 =  0.099 R7 15.591 d7 =  0.309 nd4 1.6359 v4 23.82 R8 7.503 d8 =  0.821 R9 37.197 d9 =  0.267 nd5 1.6153 v5 25.94 R10 24.313 d10 = 0.414 R11 7.249 d11 = 0.480 nd6 1.6610 v6 20.53 R12 3.938 d12 = 0.431 R13 3.424 d13 = 1.310 nd7 1.5661 v7 37.71 R14 25.82 d14 = 1.600 R15 −4.988 d15 = 0.858 nd8 1.5661 v8 37.71 R16 11.766 d16 = 0.327 R17 ∞ d17 = 0.210 ndg 1.5168 vg 64.17 R18 ∞ d18 = 0.229

In the table, meanings of various symbols will be described as follows.

S1: aperture;

R: curvature radius of an optical surface, a central curvature radius for a lens;

R1: curvature radius of the object side surface of the first lens L1;

R2: curvature radius of the image side surface of the first lens L1;

R3: curvature radius of the object side surface of the second lens L2;

R4: curvature radius of the image side surface of the second lens L2;

R5: curvature radius of the object side surface of the third lens L3;

R6: curvature radius of the image side surface of the third lens L3;

R7: curvature radius of the object side surface of the fourth lens L4;

R8: curvature radius of the image side surface of the fourth lens L4;

R9: curvature radius of the object side surface of the fifth lens L5;

R10: curvature radius of the image side surface of the fifth lens L5;

R11: curvature radius of the object side surface of the sixth lens L6;

R12: curvature radius of the image side surface of the sixth lens L6;

R13: curvature radius of the object side surface of the seventh lens L7;

R14: curvature radius of the image side surface of the seventh lens L7;

R15: curvature radius of the object side surface of the eighth lens L8;

R16: curvature radius of the image side surface of the eighth lens L8;

R17: curvature radius of an object side surface of the optical filter GF;

R18: curvature radius of an image side surface of the optical filter GF;

d: on-axis thickness of a lens and an on-axis distance between lenses;

d0: on-axis distance from the aperture S1 to the object side surface of the first lens L1;

d1: on-axis thickness of the first lens L1;

d2: on-axis distance from the image side surface of the first lens L1 to the object side surface of the second lens L2;

d3: on-axis thickness of the second lens L2;

d4: on-axis distance from the image side surface of the second lens L2 to the object side surface of the third lens L3;

d5: on-axis thickness of the third lens L3;

d6: on-axis distance from the image side surface of the third lens L3 to the object side surface of the fourth lens L4;

d7: on-axis thickness of the fourth lens L4;

d8: on-axis distance from the image side surface of the fourth lens L4 to the object side surface of the fifth lens L5;

d9: on-axis thickness of the fifth lens L5;

d10: on-axis distance from the image side surface of the fifth lens L5 to the object side surface of the sixth lens L6;

d11: on-axis thickness of the sixth lens L6;

d12: on-axis distance from the image side surface of the sixth lens L6 to the object side surface of the seventh lens L7;

d13: on-axis thickness of the seventh lens L7;

d14: on-axis distance from the image side surface of the seventh lens L7 to the object side surface of the eighth lens L8;

d15: on-axis thickness of the eighth lens L8;

d16: on-axis distance from the image side surface of the eighth lens L8 to the object side surface of the optical filter GF;

d17: on-axis thickness of the optical filter GF;

d18: on-axis distance from the image side surface of the optical filter GF to the image plane;

nd: refractive index of d line;

nd1: refractive index of d line of the first lens L1;

nd2: refractive index of d line of the second lens L2;

nd3: refractive index of d line of the third lens L3;

nd4: refractive index of d line of the fourth lens L4;

nd5: refractive index of d line of the fifth lens L5;

nd6: refractive index of d line of the sixth lens L6;

nd7: refractive index of d line of the seventh lens L7;

nd8: refractive index of d line of the eighth lens L8;

ndg: refractive index of d line of the optical filter GF;

vd: abbe number;

v1: abbe number of the first lens L1;

v2: abbe number of the second lens L2;

v3: abbe number of the third lens L3;

v4: abbe number of the fourth lens L4;

v5: abbe number of the fifth lens L5;

v6: abbe number of the sixth lens L6;

v7: abbe number of the seventh lens L7;

v8: abbe number of the eighth lens L8;

vg: abbe number of the optical filter GF.

Table 2 shows aspheric surface data of respective lens in the camera optical lens 10 according to Embodiment 1 of the present disclosure.

TABLE 2 Conic coefficient Aspherical surface coefficients k A4 A6 A8 A10 R1 −9.6782E−01 6.4300E−04 7.9013E−04 −1.1265E−03 1.2410E−03 R2 −8.7528E−01 −2.2659E−03 −3.0102E−03 3.2699E−03 −2.7233E−03 R3 8.2861E+00 −8.9660E−03 −1.2107E−02 1.0400E−02 −5.3095E−03 R4 −1.1047E+01 3.2153E−02 −6.7457E−02 6.7608E−02 −4.0655E−02 R5 9.6593E+00 3.0659E−02 −6.7004E−02 6.3446E−02 −3.5734E−02 R6 5.6841E+00 −8.0189E−03 −1.0762E−03 2.0010E−03 −1.2348E−03 R7 2.0227E+01 −3.0644E−03 −2.3698E−03 3.4906E−03 −1.7098E−03 R8 7.9403E+00 1.6117E−03 −2.7679E−03 2.1328E−03 −8.5020E−04 R9 2.3115E+02 1.0639E−02 −1.6873E−02 5.5970E−03 −1.8251E−05 R10 7.4482E+01 1.8959E−02 −2.1516E−02 7.7830E−03 −1.3191E−03 R11 −1.3680E+02 9.2011E−03 −3.8798E−03 7.5715E−04 −1.1485E−04 R12 −3.4748E+01 −1.1597E−02 4.9981E−03 −1.9221E−03 4.8673E−04 R13 −1.2105E+01 −2.6560E−03 1.0847E−04 −1.5107E−04 2.3474E−05 R14 −5.9029E+00 −4.4759E−04 −1.0080E−04 −4.4003E−05 4.6643E−06 R15 −5.3842E−01 −1.1078E−02 1.3878E−03 −9.8134E−05 9.3648E−06 R16 2.6637E+00 −7.5602E−03 2.6326E−04 1.2089E−05 −2.1422E−06 Aspherical surface coefficients A12 A14 A16 A18 A20 R1 −7.9483E−04 2.9310E−04 −6.2802E−05 7.4101E−06 −3.9112E−07 R2 1.6561E−03 −6.5286E−04 1.5439E−04 −1.9282E−05 9.2823E−07 R3 1.6924E−03 −2.8298E−04 3.1509E−06 6.7523E−06 −7.7360E−07 R4 1.5807E−02 −4.0324E−03 6.5858E−04 −6.3356E−05 2.7817E−06 R5 1.2187E−02 −2.4617E−03 2.5839E−04 −7.9509E−06 −4.6510E−07 R6 4.7995E−04 −1.3317E−04 2.4708E−05 −2.7495E−06 1.3408E−07 R7 4.5531E−04 −5.8887E−05 4.5882E−07 7.2948E−07 −5.8198E−08 R8 1.3559E−04 1.3630E−05 −8.9153E−06 1.3110E−06 −6.8925E−08 R9 −7.4031E−04 2.9770E−04 −5.7876E−05 5.7924E−06 −2.3683E−07 R10 −8.3756E−05 8.6534E−05 −1.7485E−05 1.6189E−06 −5.8357E−08 R11 1.7072E−05 −3.4217E−06 5.0482E−07 −3.8533E−08 1.1539E−09 R12 −8.2672E−05 9.0332E−06 −6.0435E−07 2.2459E−08 −3.5216E−10 R13 −2.6612E−06 2.0155E−07 −7.8116E−09 9.7800E−11 1.5930E−12 R14 −7.5524E−08 −9.2152E−09 4.9660E−10 −8.9172E−12 5.5187E−14 R15 −7.5755E−07 3.6774E−08 −1.0114E−09 1.4844E−11 −9.2607E−14 R16 1.2860E−07 −4.4650E−09 9.2690E−11 −1.0442E−12 4.7329E−15

In Table 2, k is a conic coefficient, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 are aspheric surface coefficients.

IH: Image Height

y=(x ² /R)/[1+{1−(k+1)(x ² /R ²)}^(1/2)]+A4x ⁴ +A6x ⁶ +A8x ⁸ +A10x ¹⁰ +A12x ¹² +A14x ¹⁴ +A16x ¹⁶ +A18x ¹⁸ +A20x ²⁰  (1)

In the present embodiment, an aspheric surface of each lens surface uses the aspheric surfaces shown in the above condition (1). However, the present disclosure is not limited to the aspherical polynomials form shown in the condition (1).

Table 3 and Table 4 show design data of inflexion points and arrest points of respective lens in the camera optical lens 10 according to Embodiment 1 of the present disclosure. P1R1 and P1R2 represent the object side surface and the image side surface of the first lens L1, respectively, P2R1 and P2R2 represent the object side surface and the image side surface of the second lens L2, respectively, P3R1 and P3R2 represent the object side surface and the image side surface of the third lens L3, respectively, P4R1 and P4R2 represent the object side surface and the image side surface of the fourth lens L4, respectively, P5R1 and P5R2 represent the object side surface and the image side surface of the fifth lens L5, respectively, P6R1 and P6R2 represent the object side surface and the image side surface of the sixth lens L6, respectively, P7R1 and P7R2 represent the object side surface and the image side surface of the seventh lens L7, respectively, and P8R1 and P8R2 represent the object side surface and the image side surface of the eighth lens L8, respectively. The data in the column named “inflexion point position” refers to vertical distances from inflexion points arranged on each lens surface to the optic axis of the camera optical lens 10. The data in the column named “arrest point position” refers to vertical distances from arrest points arranged on each lens surface to the optic axis of the camera optical lens 10.

TABLE 3 Number of Inflexion Inflexion Inflexion inflexion point point point points position 1 position 2 position 3 P1R1 1 1.885 P1R2 1 1.855 P2R1 3 1.055 1.515 1.915 P2R2 0 P3R1 2 1.505 1.975 P3R2 0 P4R1 1 2.145 P4R2 1 2.165 P5R1 2 0.735 2.335 P5R2 2 0.875 2.355 P6R1 1 1.335 P6R2 2 0.905 3.215 P7R1 2 1.295 3.435 P7R2 2 1.435 4.355 P8R1 1 2.785 P8R2 2 1.045 5.685

TABLE 4 Number of Arrest point arrest points position 1 P1R1 0 P1R2 0 P2R1 0 P2R2 0 P3R1 0 P3R2 0 P4R1 0 P4R2 0 P5R1 1 1.095 P5R2 1 1.325 P6R1 1 2.105 P6R2 1 2.055 P7R1 1 2.315 P7R2 1 2.155 P8R1 0 P8R2 1 1.935

FIG. 2 and FIG. 3 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and 450 nm after passing the camera optical lens 10 according to Embodiment 1. FIG. 4 illustrates a field curvature and a distortion of light with a wavelength of 546 nm after passing the camera optical lens 10 according to Embodiment 1, in which a field curvature S is a field curvature in a sagittal direction and T is a field curvature in a tangential direction.

Table 13 below further lists various values of Embodiments 1, 2, and 3 and values corresponding to parameters which are specified in the above conditions.

As shown in Table 13, Embodiment 1 satisfies respective conditions.

In this embodiment, the entrance pupil diameter of the camera optical lens is 3.881 mm. The image height of 1.0H is 7.00 mm. The FOV (field of view) is 83.20°. Thus, the camera optical lens can achieve ultra-thin, wide-angle lenses while having on-axis and off-axis aberrations sufficiently corrected, thereby leading to better optical characteristics.

Embodiment 2

Embodiment 2 is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment 1, and only differences therebetween will be described in the following.

Table 5 and Table 6 show design data of a camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 5 R d nd vd S1 ∞ d0 =  −0.493  R1 3.269 d1 =  0.375 nd1 1.5444 v1 55.82 R2 3.760 d2 =  0.374 R3 6.893 d3 =  0.436 nd2 1.6449 v2 22.54 R4 6.248 d4 =  0.076 R5 6.850 d5 =  0.985 nd3 1.5444 v3 55.82 R6 −9.477 d6 =  0.080 R7 15.275 d7 =  0.358 nd4 1.6359 v4 23.82 R8 7.528 d8 =  0.835 R9 37.051 d9 =  0.334 nd5 1.6153 v5 25.94 R10 25.000 d10 = 0.421 R11 6.165 d11 = 0.525 nd6 1.6610 v6 20.53 R12 3.901 d12 = 0.496 R13 3.355 d13 = 1.268 nd7 1.5661 v7 37.71 R14 18.247 d14 = 1.639 R15 −5.246 d15 = 1.024 nd8 1.6400 v8 23.54 R16 11.897 d16 = 0.264 R17 ∞ d17 = 0.210 ndg 1.5168 vg 64.17 R18 ∞ d18 = 0.168

Table 6 shows aspheric surface data of respective lenses in the camera optical lens 20 according to Embodiment 2 of the present disclosure.

TABLE 6 Conic coefficient Aspherical surface coefficients k A4 A6 A8 A10 R1 −1.1585E+00 −2.7109E−06 6.8417E−04 −1.1518E−03 1.2364E−03 R2 −1.0202E+00 −2.6391E−03 −3.0890E−03 3.2691E−03 −2.7225E−03 R3 8.0629E+00 −8.8993E−03 −1.2116E−02 1.0418E−02 −5.3078E−03 R4 −1.1448E+01 3.1858E−02 −6.7516E−02 6.7597E−02 −4.0659E−02 R5 9.5632E+00 3.0691E−02 −6.7066E−02 6.3439E−02 −3.5734E−02 R6 6.0340E+00 −8.1417E−03 −1.0294E−03 2.0121E−03 −1.2328E−03 R7 1.4189E+01 −3.8349E−03 −2.3426E−03 3.5014E−03 −1.7088E−03 R8 8.0712E+00 3.5087E−04 −2.8350E−03 2.1343E−03 −8.5012E−04 R9 2.2877E+02 1.1056E−02 −1.6939E−02 5.5871E−03 −1.9581E−05 R10 7.5128E+01 1.8604E−02 −2.1523E−02 7.7730E−03 −1.3202E−03 R11 −7.1477E+01 1.0044E−02 −3.8390E−03 7.6068E−04 −1.1439E−04 R12 −2.7789E+01 −1.0873E−02 5.0967E−03 −1.9156E−03 4.8693E−04 R13 −1.0202E+01 −2.0997E−03 1.3477E−04 −1.4738E−04 2.3683E−05 R14 −6.1116E+01 −6.7177E−05 −7.1928E−05 −4.6106E−05 4.5850E−06 R15 −3.7177E−01 −1.1331E−02 1.3680E−03 −9.8408E−05 9.3647E−06 R16 2.7237E+00 −7.5204E−03 2.6161E−04 1.2074E−05 −2.1398E−06 Asphencal surface coefficients A12 A14 A16 A18 A20 R1 −7.9557E−04 2.9300E−04 −6.2831E−05 7.4022E−06 −3.9388E−07 R2 1.6565E−03 −6.5281E−04 1.5434E−04 −1.9313E−05 9.1510E−07 R3 1.6929E−03 −2.8268E−04 3.2273E−06 6.7471E−06 −7.8894E−07 R4 1.5806E−02 −4.0324E−03 6.5860E−04 −6.3347E−05 2.7854E−06 R5 1.2188E−02 −2.4616E−03 2.5841E−04 −7.9451E−06 −4.6307E−07 R6 4.8041E−04 −1.3311E−04 2.4707E−05 −2.7519E−06 1.3323E−07 R7 4.5545E−04 −5.8897E−05 4.5277E−07 7.2907E−07 −5.7866E−08 R8 1.3563E−04 1.3632E−05 −8.9153E−06 1.3111E−06 −6.8819E−08 R9 −7.4037E−04 2.9771E−04 −5.7871E−05 5.7935E−06 −2.3672E−07 R10 −8.3838E−05 8.6539E−05 −1.7483E−05 1.6193E−06 −5.8338E−08 R11 1.7114E−05 −3.4214E−06 5.0454E−07 −3.8576E−08 1.1482E−09 R12 −8.2673E−05 9.0329E−06 −6.0441E−07 2.2450E−08 −3.5350E−10 R13 −2.6533E−06 2.0184E−07 −7.8285E−09 9.3608E−11 1.0562E−12 R14 −7.6596E−08 −9.1836E−09 4.9898E−10 −8.8325E−12 5.8570E−14 R15 −7.5731E−07 3.6790E−08 −1.0107E−09 1.4863E−11 −9.2850E−14 R16 1.2866E−07 −4.4638E−09 9.2697E−11 −1.0449E−12 4.6805E−15

Table 7 and Table 8 show design data of inflexion points and arrest points of respective lens in the camera optical lens 20 according to Embodiment 2 of the present disclosure.

TABLE 7 Number of Inflexion Inflexion Inflexion inflexion point point point points position 1 position 2 position 3 P1R1 1 1.755 P1R2 1 1.745 P2R1 3 1.055 1.475 1.855 P2R2 0 P3R1 2 1.505 1.955 P3R2 0 P4R1 1 2.175 P4R2 1 2.155 P5R1 2 0.745 2.315 P5R2 2 0.855 2.365 P6R1 1 1.505 P6R2 2 1.045 3.375 P7R1 2 1.395 3.555 P7R2 2 1.505 4.375 P8R1 1 2.945 P8R2 2 1.045 5.895

TABLE 8 Number of Arrest point arrest points position 1 P1R1 0 P1R2 0 P2R1 0 P2R2 0 P3R1 P3R2 0 P4R1 0 P4R2 0 P5R1 1 1.105 P5R2 1 1.295 P6R1 1 2.345 P6R2 1 2.465 P7R1 1 2.475 P7R2 1 2.315 P8R1 0 P8R2 1 1.935

FIG. 6 and FIG. 7 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and 450 nm after passing the camera optical lens 20 according to Embodiment 2. FIG. 8 illustrates afield curvature and a distortion of light with a wavelength of 546 nm after passing the camera optical lens 20 according to Embodiment 2.

As shown in Table 13, Embodiment 2 satisfies respective conditions.

In this embodiment, the entrance pupil diameter of the camera optical lens is 3.797 mm. The image height of 1.0H is 7.0 mm. The FOV (field of view) is 84.600. Thus, the camera optical lens can achieve ultra-thin, wide-angle lenses while having on-axis and off-axis aberrations sufficiently corrected, thereby leading to better optical characteristics.

Embodiment 3

Embodiment 3 is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment 1, and only differences therebetween will be described in the following.

Table 9 and Table 10 show design data of a camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 9 R d nd vd S1 ∞ d0 =  −0.468  R1 3.275 d1 =  0.347 nd1 1.5444 v1 55.82 R2 3.594 d2 =  0.357 R3 6.811 d3 =  0.437 nd2 1.6449 v2 22.54 R4 6.220 d4 =  0.076 R5 6.843 d5 =  0.972 nd3 1.5444 v3 55.82 R6 −9.341 d6 =  0.080 R7 15.021 d7 =  0.427 nd4 1.6359 v4 23.82 R8 7.581 d8 =  0.824 R9 37.223 d9 =  0.342 nd5 1.6153 v5 25.94 R10 24.638 d10 = 0.414 R11 6.160 d11 = 0.571 nd6 1.6610 v6 20.53 R12 4.096 d12 = 0.535 R13 3.319 d13 = 1.272 nd7 1.5661 v7 37.71 R14 14.708 d14 = 1.649 R15 −5.625 d15 = 1.126 nd8 1.6700 v8 19.39 R16 11.957 d16 = 0.245 R15 ∞ d17 = 0.210 ndg 1.5168 vg 64.17 R16 ∞ d18 = 0.149

Table 10 shows aspheric surface data of respective lenses in the camera optical lens 30 according to Embodiment 3 of the present disclosure.

TABLE 10 Conic coefficient Asphencal surface coefficients k A4 A6 A8 A10 R1 −1.3928E+00 −6.5068E−04 6.2624E−04 −1.1609E−03 1.2348E−03 R2 −1.3759E+00 −3.3847E−03 −3.1195E−03 3.2642E−03 −2.7218E−03 R3 7.9754E+00 −8.9189E−03 −1.2212E−02 1.0427E−02 −5.3048E−03 R4 −1.1304E+01 3.1912E−02 −6.7517E−02 6.7591E−02 −4.0660E−02 R5 9.5438E+00 3.0387E−02 −6.7066E−02 6.3443E−02 −3.5733E−02 R6 5.1815E+00 −7.9920E−03 −9.9076E−04 2.0180E−03 −1.2319E−03 R7 1.6075E+01 −3.9767E−03 −2.3097E−03 3.5065E−03 −1.7090E−03 R8 8.0329E+00 −2.0391E−04 −2.8363E−03 2.1307E−03 −8.5069E−04 R9 2.2694E+02 1.1518E−02 −1.7028E−02 5.5775E−03 −2.0538E−05 R10 8.2389E+01 1.8549E−02 −2.1562E−02 7.7640E−03 −1.3210E−03 R11 −6.3960E+01 1.0063E−02 −3.8380E−03 7.6505E−04 −1.1446E−04 R12 −2.8226E+01 −1.0960E−02 5.1230E−03 −1.9145E−03 4.8700E−04 R13 −9.4244E+00 −2.1208E−03 1.5596E−04 −1.4655E−04 2.3704E−05 R14 −5.5708E+01 −3.2796E−04 −5.9603E−05 −4.6208E−05 4.5622E−06 R15 −2.2357E−01 −1.1619E−02 1.3525E−03 −9.8794E−05 9.3597E−06 R16 2.7276E+00 −7.4785E−03 2.6267E−04 1.2094E−05 −2.1400E−06 Asphencal surface coefficients A12 A14 A16 A18 A20 R1 −7.9593E−04 2.9289E−04 −6.2850E−05 7.4004E−06 −3.9310E−07 R2 1.6569E−03 −6.5268E−04 1.5434E−04 −1.9334E−05 9.0525E−07 R3 1.6936E−03 −2.8251E−04 3.2490E−06 6.7356E−06 −8.0028E−07 R4 1.5806E−02 −4.0325E−03 6.5861E−04 −6.3344E−05 2.7861E−06 R5 1.2188E−02 −2.4616E−03 2.5840E−04 −7.9451E−06 −4.6272E−07 R6 4.8058E−04 −1.3310E−04 2.4708E−05 −2.7531E−06 1.3279E−07 R7 4.5527E−04 −5.8938E−05 4.4943E−07 7.2968E−07 −5.7452E−08 R8 1.3564E−04 1.3644E−05 −8.9136E−06 1.3114E−06 −6.8772E−08 R9 −7.4041E−04 2.9772E−04 −5.7868E−05 5.7939E−06 −2.3664E−07 R10 −8.3865E−05 8.6540E−05 −1.7482E−05 1.6194E−06 −5.8304E−08 R11 1.7108E−05 −3.4190E−06 5.0486E−07 −3.8562E−08 1.1448E−09 R12 −8.2669E−05 9.0331E−06 −6.0441E−07 2.2448E−08 −3.5378E−10 R13 −2.6528E−06 2.0184E−07 −7.8308E−09 9.3268E−11 1.0166E−12 R14 −7.7475E−08 −9.1982E−09 4.9944E−10 −8.7665E−12 6.3436E−14 R15 −7.5718E−07 3.6804E−08 −1.0100E−09 1.4896E−11 −9.1395E−14 R16 1.2864E−07 −4.4643E−09 9.2691E−11 −1.0448E−12 4.6941E−15

Table 11 and Table 12 show design data of inflexion points and arrest points of respective lens in the camera optical lens 30 according to Embodiment 3 of the present disclosure.

TABLE 11 Number of Inflexion Inflexion Inflexion inflexion point point point points position 1 position 2 position 3 P1R1 1 1.695 P1R2 1 1.695 P2R1 3 1.065 1.445 1.815 P2R2 0 P3R1 2 1.495 1.955 P3R2 0 P4R1 1 2.205 P4R2 1 2.125 P5R1 2 0.745 2.315 P5R2 2 0.865 2.355 P6R1 1 1.535 P6R2 2 1.055 3.385 P7R1 2 1.425 3.535 P7R2 2 1.485 4.315 P8R1 3 3.295 3.535 3.925 P8R2 2 1.045 5.925

TABLE 12 Number of Arrest point arrest points position 1 P1R1 0 P1R2 0 P2R1 0 P2R2 0 P3R1 0 P3R2 0 P4R1 0 P4R2 0 P5R1 1 1.115 P5R2 1 1.295 P6R1 1 2.395 P6R2 1 2.555 P7R1 1 2.535 P7R2 1 2.335 P8R1 0 P8R2 1 1.935

FIG. 10 and FIG. 11 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and 450 nm after passing the camera optical lens 30 according to Embodiment 3. FIG. 12 illustrates field curvature and distortion of light with a wavelength of 546 nm after passing the camera optical lens 30 according to Embodiment 3.

Table 13 below further lists various values of the present embodiment and values corresponding to parameters which are specified in the above conditions. Obviously, the camera optical lens according to this embodiment satisfies the above conditions.

In this embodiment, the entrance pupil diameter of the camera optical lens is 3.797 mm. The image height of 1.0H is 7.0 mm. The FOV (field of view) is 84.50°. Thus, the camera optical lens can achieve ultra-thin, wide-angle lenses while having on-axis and off-axis aberrations sufficiently corrected, thereby leading to better optical characteristics.

TABLE 13 Parameters and Conditions Embodiment 1 Embodiment 2 Embodiment 3 f1/f 3.51 4.75 6.42 f2 −143.28 −139.58 −155.50 n8 1.57 1.64 1.67 f 7.762 7.594 7.595 f1 27.231 36.063 48.758 f3 7.518 7.431 7.381 f4 −22.864 −23.537 −24.377 f5 −113.962 −125.132 −118.603 f6 −13.692 −17.518 −20.563 f7 6.785 7.000 7.230 f8 −6.037 −5.503 −5.499 f12 31.938 46.100 66.958 Fno 2.00 2.00 2.00

Fno denotes an F number of the camera optical lens.

It can be appreciated by one having ordinary skill in the art that the description above is only embodiments of the present disclosure. In practice, one having ordinary skill in the art can make various modifications to these embodiments in forms and details without departing from the spirit and scope of the present disclosure. 

What is claimed is:
 1. A camera optical lens, comprising, from an object side to an image side: a first lens; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; a seventh lens; and an eighth lens, wherein the camera optical lens satisfies following conditions: 3.50≤f1/f≤6.50; f2≤0; and 1.55≤n8≤1.70, where f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; f2 denotes a focal length of the second lens; and n8 denotes a refractive index of the eighth lens.
 2. The camera optical lens as described in claim 1, further satisfying a following condition: −22.00≤(R1+R2)/(R1−R2)≤−10.00, where R1 denotes a curvature radius of an object side surface of the first lens; and R2 denotes a curvature radius of an image side surface of the first lens.
 3. The camera optical lens as described in claim 1, further satisfying a following condition: −3.00≤f6/f≤−1.50, where f6 denotes a focal length of the sixth lens.
 4. The camera optical lens as described in claim 1, further satisfying a following condition: 0.02≤d1/TTL≤0.07, where d1 denotes an on-axis thickness of the first lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 5. The camera optical lens as described in claim 1, further satisfying following conditions: −40.95≤f2/f≤−12.25; 10.10≤(R3+R4)/(R3−R4)≤33.07;and 0.02≤d3/TTL≤0.07, where R3 denotes a curvature radius of an object side surface of the second lens; R4 denotes a curvature radius of an image side surface of the second lens; d3 denotes an on-axis thickness of the second lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 6. The camera optical lens as described in claim 1, further satisfying following conditions: 0.48≤f3/f≤1.47; −0.35≤(R5+R6)/(R5−R6)≤−0.10; and 0.05≤d5/TTL≤0.15, where f3 denotes a focal length of the third lens; R5 denotes a curvature radius of an object side surface of the third lens; R6 denotes a curvature radius of an image side surface of the third lens; d5 denotes an on-axis thickness of the third lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 7. The camera optical lens as described in claim 1, further satisfying following conditions: −6.42≤f4/f≤−1.96; 1.43≤(R7+R8)/(R7−R8)≤4.56;and 0.02≤d7/TTL≤0.06, where f4 denotes a focal length of the fourth lens; R7 denotes a curvature radius of an object side surface of the fourth lens; R8 denotes a curvature radius of an image side surface of the fourth lens; d7 denotes an on-axis thickness of the fourth lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 8. The camera optical lens as described in claim 1, further satisfying following conditions: −32.96≤f5/f≤−9.79; 2.39≤(R9+R10)/(R9−R10)≤7.72;and 0.01≤d9/TTL≤0.05, where f5 denotes a focal length of the fifth lens; R9 denotes a curvature radius of an object side surface of the fifth lens; R10 denotes a curvature radius of an image side surface of the fifth lens; d9 denotes an on-axis thickness of the fifth lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 9. The camera optical lens as described in claim 1, further satisfying following conditions: 1.69≤(R11+R12)/(R11−R12)≤7.45; and 0.02≤d11/TTL≤0.09, where R11 denotes a curvature radius of an object side surface of the sixth lens; R12 denotes a curvature radius of an image side surface of the sixth lens; d11 denotes an on-axis thickness of the sixth lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 10. The camera optical lens as described in claim 1, further satisfying following conditions: 0.44≤f7/f≤1.43; −3.17≤(R13+R14)/(R13−R14)≤−0.87;and 0.06≤d13/TTL≤0.20, where f7 denotes a focal length of the seventh lens; R13 denotes a curvature radius of an object side surface of the seventh lens; R14 denotes a curvature radius of an image side surface of the seventh lens; d13 denotes an on-axis thickness of the seventh lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 11. The camera optical lens as described in claim 1, further satisfying following conditions: −1.56≤f8/f≤−0.48; −0.81≤(R15+R16)/(R15−R16)≤−0.24;and 0.04≤d15/TTL≤0.17, where f8 denotes a focal length of the eighth lens; R15 denotes a curvature radius of an object side surface of the eighth lens; R16 denotes a curvature radius of an image side surface of the eighth lens; d15 denotes an on-axis thickness of the eighth lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis. 